CyberHunter
Local dataset, no network
// Other services

Port 4987: SMAR Ethernet Port 1

Port 4987 is assigned by IANA to smar-se-port1 (SMAR Ethernet Port 1).

4987

How smar-se-port1 works

Other services
client:4987smar-se-port1response client:4987smar-se-port1response

The client sends a request to port 4987 and the smar-se-port1 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 4987 dangerous?

We have no specific security note for port 4987. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 4987

ServicePortTransportDescriptionReferenceUpdated
smar-se-port1 4987 TCP, UDP SMAR Ethernet Port 1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4987, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4987'      # process listening on 4987
sudo lsof -nP -i :4987

macOS

sudo lsof -nP -i :4987

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4987 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4987
netstat -ano | findstr :4987

From another machine

nmap -p 4987 -sV <host>
sudo nmap -sU -p 4987 <host>
nc -zv <host> 4987

Block it in the firewall

sudo ufw deny 4987/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4987" -Direction Inbound -LocalPort 4987 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4987 used for?

Port 4987 is assigned by IANA to smar-se-port1 (SMAR Ethernet Port 1).

Is port 4987 TCP or UDP?

Port 4987 is registered for TCP and UDP.

Is it safe to open port 4987?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 4987 is open?

On Linux run "ss -ltnup 'sport = :4987'", on macOS "lsof -nP -i :4987", and on Windows "netstat -ano | findstr :4987" to see the local process. From another machine, "nmap -p 4987 <host>" shows whether it is reachable.

05 Related
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